oppositesOpposites are things that are very, very different from each other. Some examples of opposites are: positive and negative, add and subtract, left and right, big and small, up and down.

orbAn orb is a ball-shaped object.

order of magnitudeThe order of magnitude is the estimate of size (or magnitude) expressed as a power of ten. For example, a 100 ft (102 ft) tall building one order of magnitude taller than a 10 ft (101 ft) tall building.